Cited by 964PI3K/AKT/mTOR signaling in cancerCancer, Hypoxia, and MetabolismProstate Cancer Treatment and Research

mTOR inhibition reverses Akt-dependent prostate intraepithelial neoplasia through regulation of apoptotic and HIF-1-dependent pathways

Majumder, Pradip K, Febbo, Phillip G, Bikoff, Rachel, Berger, Raanan, Xue, Qi, McMahon, Louis M, Manola, Judith, Brugarolas, James +5 more·2004·Nature Medicine

Abstract

Loss of PTEN function leads to activation of phosphoinositide 3-kinase (PI3K) signaling and Akt. Clinical trials are now testing whether mammalian target of rapamycin (mTOR) inhibition is useful in treating PTEN-null cancers. Here, we report that mTOR inhibition induced apoptosis of epithelial cells and the complete reversal of a neoplastic phenotype in the prostate of mice expressing human AKT1 in the ventral prostate. Induction of cell death required the mitochondrial pathway, as prostate-specific coexpression of BCL2 blocked apoptosis. Thus, there is an mTOR-dependent survival signal required downstream of Akt. Bcl2 expression, however, only partially restored intraluminal cell growth in the setting of mTOR inhibition. Expression profiling showed that Hif-1 alpha targets, including genes encoding most glycolytic enzymes, constituted the dominant transcriptional response to AKT activation and mTOR inhibition. These data suggest that the expansion of AKT-driven prostate epithelial cells requires mTOR-dependent survival signaling and activation of HIF-1 alpha, and that clinical resistance to mTOR inhibitors may emerge through BCL2 expression and/or upregulation of HIF-1 alpha activity.

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Crossref · 10.1038/nm1052

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  • Several studies have shown that mTOR inhibition decreases HIF-1α and HIF-2α levels under both normoxic and hypoxic conditions.

    “Consistent with this, several studies have shown that mTOR inhibition decreases HIF-1α and HIF-2α levels under both normoxic and hypoxic conditions (Hudson et al., 2002;Majumder et al., 2004;Thomas et al., 2006;Mohlin et al., 2015).”

    From Therapeutic targeting of hypoxia and hypoxia-inducible factors in cancer (2016) · cites this paper as Majumder et al., 2004

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Authors
Majumder, P. K., Febbo, P. G., Bikoff, R., Berger, R., Xue, Q., McMahon, L. M., Manola, J., Brugarolas, J., McDonnell, T. J., Golub, T. R., Loda, M., Lane, H. A., & Sellers, W. R.
Affiliations
  • Brigham and Women's Hospital (US)
  • Dana-Farber Cancer Institute (US)
  • The University of Texas MD Anderson Cancer Center (US)
  • Broad Institute (US)
  • Novartis (Switzerland) (CH)
Corresponding author
Sellers, William R
Venue
Nature Medicine
Published
2004-05-23
Volume
10
Issue
6
Pages
594-601
ISSN
  • 1078-8956 (ISSN-L)
  • 1546-170X
OpenAlex
W2164895949
Cited by
964
References
50
Citations by year
2026: 4 · 2025: 9 · 2024: 20 · 2023: 41 · 2022: 16 · 2021: 35 · 2020: 18 · 2019: 29 · 2018: 30 · 2017: 24 · 2016: 41 · 2015: 46 · 2014: 55 · 2013: 51 · 2012: 57
FWCI
24.98
Type
journal article
Language
en
Open access
closed
Locations
  • Nature Medicine (publishedVersion)
  • PubMed (publishedVersion)
Funders
National Cancer Institute (P01CA089021, P01 CA 89021)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › PI3K/AKT/mTOR signaling in cancer
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › Cancer, Hypoxia, and Metabolism
  • Health Sciences › Medicine › Pulmonary and Respiratory Medicine › Prostate Cancer Treatment and Research
Keywords
mTOR inhibition, Akt signaling, prostatic intraepithelial neoplasia, PTEN loss, PI3K signaling, apoptosis, mitochondrial apoptosis, Bcl-2, HIF-1α, glycolytic gene expression, mTOR inhibitor resistance, prostate cancer
MeSH terms
Everolimus, Animals, Cell Survival, Epithelial Cells, Humans, Immunosuppressive Agents, Male, Mice, Inbred C57BL, Mice, Transgenic, Phenotype, Placebos, Prostate, Prostatic Neoplasms, Protein Kinases, Proto-Oncogene Proteins, Transcription Factors, Signal Transduction, Apoptosis, Protein Serine-Threonine Kinases, Proto-Oncogene Proteins c-bcl-2, Sirolimus, In Situ Nick-End Labeling, Gene Expression Profiling, Protein Kinase Inhibitors, Proto-Oncogene Proteins c-akt, Mice, Hypoxia-Inducible Factor 1, alpha Subunit, TOR Serine-Threonine Kinases

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